Dumbbell



FIG. 1 is a perspective view of a dumbbell showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is perspective view of the dumbbell where the dumbbell is in a configuration of use;

FIG. 10 is an enlarged view of portion 10 shown in FIG. 1;

FIG. 11 is a perspective view of a discus of the dumbbell, shown separately for illustration;

FIG. 12 is another perspective view thereof;

FIG. 13 is a front elevational view thereof; and,

FIG. 14 is a rear elevational view thereof.

The broken lines in the drawings depict portions of the dumbbell that form no part of the claimed design. 

CLAIM The ornamental design for a dumbbell, as shown and described. 